SB2026100959 - Out-of-bounds read in Linux kernel bpf prog_tests

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Main Vulnerability Database SB2026100959

SB2026100959 - Out-of-bounds read in Linux kernel bpf prog_tests

Published: October 9, 2026

Security Bulletin ID SB2026100959
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-98376)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to read memory outside the bounds of a per-cpu array's pointer storage.

The vulnerability exists due to an out-of-bounds read caused by missing max_entries validation in the BPF per-cpu array inner-map handling code when processing lookups after an inner map is replaced with a smaller map. A local user can replace an inner map with one containing fewer entries and trigger a lookup using the original template's JIT-inlined index_mask to read memory outside the bounds of the pptrs[] array.


Remediation

Install update from vendor's website.

References